Cross-correlation search for continuous gravitational waves from a compact object in SNR 1987A in LIGO Science Run 5

Abstract

We present the results of a cross-correlation search for gravitational waves from SNR 1987A using the second year of LIGO Science Run 5 data. The frequency band 75--450\,Hz is searched. No evidence of gravitational waves is found. A 90\% confidence upper limit of $h_0\le 3.8\times 10^{-25}$ is placed on the gravitational wave strain at the most sensitive frequency near 150\,Hz. This corresponds to an ellipticity of $\epsilon \le 8.2\times 10^{-4}$ and improves on previously published strain upper limits by a factor $\approx 4$. We perform a comprehensive suite of validations of the search algorithm and identify several computational savings which marginally sacrifice sensitivity in order to streamline the parameter space being searched. We estimate detection thresholds and sensitivities through Monte-Carlo simulations.

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